39 строки
2.0 KiB
ReStructuredText
39 строки
2.0 KiB
ReStructuredText
|
===========
|
||
|
|
Metronomefb
|
||
|
|
===========
|
||
|
|
|
||
|
Maintained by Jaya Kumar <jayakumar.lkml.gmail.com>
|
||
|
|
|
||
|
|
Last revised: Mar 10, 2008
|
||
|
|
|
||
|
|
Metronomefb is a driver for the Metronome display controller. The controller
|
||
|
|
is from E-Ink Corporation. It is intended to be used to drive the E-Ink
|
||
|
|
Vizplex display media. E-Ink hosts some details of this controller and the
|
||
|
|
display media here http://www.e-ink.com/products/matrix/metronome.html .
|
||
|
|
|
||
|
|
Metronome is interfaced to the host CPU through the AMLCD interface. The
|
||
|
|
host CPU generates the control information and the image in a framebuffer
|
||
|
|
which is then delivered to the AMLCD interface by a host specific method.
|
||
|
|
The display and error status are each pulled through individual GPIOs.
|
||
|
|
|
||
|
|
Metronomefb is platform independent and depends on a board specific driver
|
||
|
|
to do all physical IO work. Currently, an example is implemented for the
|
||
|
|
PXA board used in the AM-200 EPD devkit. This example is am200epd.c
|
||
|
|
|
||
|
|
Metronomefb requires waveform information which is delivered via the AMLCD
|
||
|
|
interface to the metronome controller. The waveform information is expected to
|
||
|
|
be delivered from userspace via the firmware class interface. The waveform file
|
||
|
|
can be compressed as long as your udev or hotplug script is aware of the need
|
||
|
|
to uncompress it before delivering it. metronomefb will ask for metronome.wbf
|
||
|
|
which would typically go into /lib/firmware/metronome.wbf depending on your
|
||
|
|
udev/hotplug setup. I have only tested with a single waveform file which was
|
||
|
|
originally labeled 23P01201_60_WT0107_MTC. I do not know what it stands for.
|
||
|
|
Caution should be exercised when manipulating the waveform as there may be
|
||
|
|
a possibility that it could have some permanent effects on the display media.
|
||
|
|
I neither have access to nor know exactly what the waveform does in terms of
|
||
|
|
the physical media.
|
||
|
|
|
||
|
|
Metronomefb uses the deferred IO interface so that it can provide a memory
|
||
|
|
mappable frame buffer. It has been tested with tinyx (Xfbdev). It is known
|
||
|
|
to work at this time with xeyes, xclock, xloadimage, xpdf.
|